Alizarin Red S, Sodium Salt 72+% (Dye content)

RT

342, 26

Brownish yellow powder

Used in the biochemical assay to determine the presence of calcium.

Synonyms:
3, 4-Dihydroxy-9, 10-dioxo-2-anthracenesulfonic acid sodium salt CI 58005

CAS No:
130-22-3

Molecular Formula:
C14H7O7SNa

Molecular Weight:
342.26

Purity:
≥72% (Dye content)

Appearance:
Brownish yellow powder

Visual Transition Range:
pH 4.3 (Brilliant yellow) to pH 6.3 (Pink)
pH 9.4 (Brown orange) to pH 12.0 (Violet)

Absorptivity:
λmax 595nm (0.1N NaOH): ≥320
λmax 556nm (0.1N NaOH): ≥350

Loss on Drying (110°C):
≤5%

Solubility (1mg/ml in H2O):
Clear solution

Storage and Stability:
Powder may be stored at RT. Stable for 12 months at RT after receipt.